LOOE KEY, Florida Keys - Rock legends are to celebrate the "key of sea" in Lower Keys waters Saturday, July 14, as divers portraying Sonny and Cher, Elton John, David Crosby and even a mermaid Madonna rock the reef during the 23rd annual Underwater Music Festival.The scuba-diving superstars are to "perform" beneath the waves during the offbeat underwater event, which draws as many as 600 divers and snorkelers each year to explore the colorful diversity of marine life that characterizes North America's only living coral barrier reef.

The underwater songfest is set for 10 a.m. to 2 p.m. at Looe Key Reef, an area of the Florida Keys National Marine Sanctuary located approximately six miles south of Big Pine Key. Staged by local radio station WWUS 104.1 FM, it features the station's selections broadcast underwater via Lubell Laboratory speakers suspended beneath boats positioned at the reef.The playlist typically includes ocean-themed ditties such as the Beatles' "Yellow Submarine, " Jimmy Buffett's "Fins" and even an authentic humpback whale song.